Comparison Operators

Comparison operators, as their name imply, allow you to compare two values.

Table 10-4. Comparson Operators

$a == $bEqualTrue if $a is equal to $b.
$a != $bNot equalTrue if $a is not equal to $b.
$a < $bLess thanTrue if $a is strictly less than $b.
$a > $bGreater thanTrue if $a is strictly greater than $b.
$a <= $bLess than or equal to True if $a is less than or equal to $b.
$a >= $bGreater than or equal to True if $a is greater than or equal to $b.

Another conditional operator is the "?:" (or trinary) operator, which operates as in C and many other languages.

(expr1) ? (expr2) : (expr3);

This expression returns to expr2 if expr1 evalutes to true, and expr3 if expr1 evaluates to false.